added readme and changelog

CHANGELOG.md

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+# Changelog
+
+v0.1
+
+* Added README.md and CHANGELOG.md files

README.md

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+# SimpleSAMLPhp development setup for working with Samly Elixir Library
+
+This repo is based on `https://github.com/hcpss-banderson/docker-simplesamlphp`
+repo. It has been modified to setup SimpleSAMLPhp as an IDP using the
+`example-userpass` authentication module. Template for registering a SAML
+service provider is also included.
+
+## Building Docker Image
+
+```sh
+./build.sh
+```
+
+This creates `samlysaml:latest` docker image. Modify the `Dockerfile` if you
+want to change the `SimpleSAMLPhp` version. The image is based on the stock
+Alpine PHP.
+
+## Customize the Setup Parameters
+
+Edit `setup/params/params.yml` file. Make sure to change the values appropriately.
+Especially pay attention to values set as `changeme`. Change the `timezone`
+value.
+
+Edit the `users` section with the test users you need. At the least change
+the passwords.
+
+> Add the `idp_host` to your local `/etc/hosts` file.
+
+## Register the SAML Service Provider
+
+In the same params.yml file, change the values for `service_providers` section.
+Each entry that starts with a dash represents a SAML service provider that
+needs to interact with the SimpleSAMLPhp IDP provider you are going to create.
+
+The `base_url` should point to the `sso` route in your Elixir Plug/Phoenix
+application. Set `name` to the name of your application. Follow the instructions
+in [`Samly`](https://github.com/handnot2/samly) to create openssl certificate
+and copy that file as `sp/myapp/sp.crt` under `setup` directory.
+
+The compose setup process will use these parameters and the templates under
+`setup/templates` to properly setup a SAML IdP.
+
+## Create SAML IDP
+
+Once the setup is done as described above, just run `docker-compose up -d`.
+This should setup a data container with SimpleSAMLPhp bits, launch PHP
+in a separate container as an upstream service and start Nginx fronting
+access to PHP.
+
+> You need to `docker-compose down` and `docker-compose up -d` again to
+> have a functioning service the first time around. This is due to services
+> not knowing when some of the setup is completed before starting. Yes, this
+> could be addressed down the line. But this workaround is good enough for now.
+
+## Validate the setup
+
+Visit the URL `http://samly.idp:8082/simplesaml`. You should be able to login
+as administrator using the password you set for `auth_adminpassword` in
+the `setup/params/params.yml` file.
+
+Check out the `Federation` tab. You should see the SAML service provider you
+registered.
+
+If there are any errors in the process, you should be able to change the
+parameters in `setup/params/params.yml` file, bring down the containers
+using `docker-compose down` and re-create using `docker-compose up -d`.
+
+This same process works with you want to make changes/additions to the
+service providers.
+
+## Caution
+
+Keep in mind this is meant for development purposes only.